DuPont™ StraightFlash™ is a premium self- adhered flashing material that is ideal for helping to protect heads and jambs of windows and doors. Constructed with a durable, micro-creped DuPont™ Tyvek® top-sheet, a 100% butyl adhesive layer, and a specially designed, scored release liner. Straightflash is a 30mil butyl that can be used on commercial and residential application and has a polyethylene (i.e. Tyvek) surface finish.